Tup.Cobar4Net.Parser.Ast.Fragment.Tableref.OuterJoin.EnsureListType C# (CSharp) Метод

        private static IList<string> EnsureListType(IList<string> list)
        {
            if (list == null)
            {
                return null;
            }
            if (list.IsEmpty())
            {
                return new List<string>(0);
            }
            if (list is List<string>)
            {
                return list;
            }
            return new List<string>(list);
        }